ZAGREB - Croatia's Marin Cilic, currently world number 15, failed a drug test at the April Munich tournament and the International Tennis Federation (ITF) is probing the case. Cilic failed the test only two weeks after passing a doping control at the Monte Carlo Masters, the Slobodna Dalmacija daily reported. "More details will emerge next week as the 24-year-old Croatian sent his explanation to the ITF,” the daily said. "There are no comments until we will be able to comment," Cilic's manager Vincent Stavaux was quoted as saying. Cilic's test was allegedly positive due to "incautious use of glucose. Local media said that Cilic had found out about the positive results of the test during Wimbledon, adding that this was the reason the 24-year old withdrew from the match against France's Kenny de Schepper. –AFP